QuakeIndex

mining explosion · reviewed by a seismologist

M 3.2ml

20 km SSE of Sleepy Hollow, Wyoming

· 0.0 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Campbell County 21 kmWeston County 65 kmCrook County 83 kmJohnson County 101 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 3.2 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Campbell County, 21 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1892 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

USGS catalogues this as mining explosion, not an earthquake.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 44.0697, -105.3213. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Campbell County, WY 21 km (13 mi) SE of here earthquakes near Campbell County
Weston County, WY 65 km (40 mi) WNW of here earthquakes near Weston County
Crook County, WY 83 km (52 mi) SW of here earthquakes near Crook County
Johnson County, WY 101 km (63 mi) E of here earthquakes near Johnson County
Niobrara County, WY 131 km (82 mi) NNW of here earthquakes near Niobrara County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 3.2 16 km E of Wright, Wyoming
  2. 3.3 28 km ENE of Wright, Wyoming
  3. 2.9 37 km ENE of Wright, Wyoming
  4. 3.1 7 km SE of Wright, Wyoming
  5. 3.3 7 km ENE of Wright, Wyoming
  6. 3.3 17 km ENE of Wright, Wyoming
  7. 3.0 25 km S of Antelope Valley-Crestview, Wyoming
  8. 2.3 2 km S of Antelope Valley-Crestview, Wyoming
  9. 2.6 8 km E of Wright, Wyoming
  10. 2.8 12 km N of Wright, Wyoming
  11. 3.0 8 km NNW of Wright, Wyoming
  12. 2.9 8 km NE of Gillette, Wyoming
  13. 3.1 13 km ENE of Wright, Wyoming
  14. 3.2 19 km ESE of Wright, Wyoming
  15. 3.4 5 km ESE of Wright, Wyoming

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

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